Set 2: Exponential Functions (Advanced)

**Choice D is the best answer.** After 1 half-lives: 480 / 2 to the power of 1 = 240 grams

Explanation

Answer: D

PROBLEM

A substance with half-life of 1 hour starts at 480 grams. How many grams remain after 1 hours?

242

120

239

240

✓ Correct

Detailed Explanation

Choice D is the best answer. After 1 half-lives: 480 / 2 to the power of 1 = 240 grams

Why others are wrong:

A: 242 is incorrect because it does not satisfy the equation.

B: 120 is incorrect because it does not satisfy the equation.

C: 239 is incorrect because it does not satisfy the equation.